Adds iptables --list-rules (-S) command, acting as a combination of
iptables --list and iptables-save.
The primary motivation behind this patch is to get iptables-save like
output capabilities in iptables-restore, allowing "iptables-restore -n"
to be used as a consistent API to iptables for all kind of operations,
not only blind updates..
As a bonus iptables also gets the capability of printing the rules
as-is.
This completely replaces the earlier patch which added the --rules
option.
Henrik Nordstrom <henrik@henriknordstrom.net>